| 摘要 |
PURPOSE:To produce a magnetic disk substrate having a uniformly and adequately roughened surface by forming an Ni alloy plating layer on an Al alloy substrate and polishing the surface to a specular surface then heat-treating teh surface in an oxidizing atmosphere thereby roughening the surface. CONSTITUTION:The Ni alloy plating layer of Ni-P, etc., is formed by an electroless or electroplating method on the Al alloy substrate. After the surface thereof is polished to the specular surface, the surface is heat-treated for about >=10 minutes, more preferably about >=1 hours at about >=200 deg.C, more preferably about 260-400 deg.C in air or oxidizing atmosphere. The thin film magnetic disk substrate which has the uniformly and adequately roughened surface without having scratches, flaws, pits, etc., and is used for a high-density magnetic disk device is obtd. by the above-mentioned treatment.
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